Payoff Hand?

2/4 6-max @ UB 5-handed at time. First 20 hands or so, no real read on villian. Hero has AKo utg.

Preflop: Hero raises, folded to BB who calls.

Flop: AJ4, two spades.
Villians checks and calls.

Turn: J
Villian check/raises. Hero??

Does anyone pay this off against unknown?

[imported_leader]

Call down everytime. You'll see AX a lot or a flush draw sometimes. You can't fold.

[raze]

Definitely call down especially since you'd like to get a read on this guy's checkraise.